Wayne C. Thompson (9 August 2012). Western Europe 2012. Stryker Post. p. 283. ISBN978-1-61048-898-3. https://books.google.com/books?id=lKCMvYFQCCMC&pg=PA28327 May 2013閲覧. "Greeks are already among the three largest investors in Bulgaria, Romania and Serbia, and overall Greek investment in the ... Its banking sector represents 16% of banking activities in the region, and Greek banks open a new branch in a Balkan country almost weekly."